DonBosco

It wont work if he is creating an <ol>, he has to remove the closing tag for the main list item and put it after...

Question | HTML Validation: UL in UL causes error "ul not allowed as child of element ul in this context"

You will need to remove the close tag of your first list item and place it after the unordered list like that: ...

Question | HTML Validation: UL in UL causes error "ul not allowed as child of element ul in this context"